Do not be so sure that a deep hole will give stable temperature. I measured a nice sinusoid of about 0.3 *C over a year in a cave about 10 metres below the surface. The attenuation function depends on the thermal diffusivity of the soil/rock, but that does not vary widely. As you go deeper you get a delayed history of the surface temperature. A good oven runs rings around deep earth stability. cheers, Neville Michie
On 26/09/2012, at 3:32 PM, Tom Van Baak wrote: >> How good a clock could you get at much lower power? I guess I'm looking for >> something (logarithmically) between a watch and a GPSDO. > > This one keeps very good time long-term with no power: http://longnow.org/ > > /tvb > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
